linphone-desktop/tests/ui/modules/Common/Image/RoundedImage.qml

import QtQuick 2.7

// ===================================================================

Item {
  property alias source: image.source

  Item {
    id: imageContainer

    anchors.fill: parent
    layer.enabled: true
    visible: false

    Image {
      id: image

      anchors.fill: parent
      fillMode: Image.PreserveAspectCrop
    }
  }

  Rectangle {
    anchors.fill: parent
    layer.enabled: true
    layer.samplerName: 'mask'
    radius: parent.width / 2

    layer.effect: ShaderEffect {
      property var image: imageContainer

      fragmentShader: "
        uniform lowp sampler2D image;
        uniform lowp sampler2D mask;
        uniform lowp float qt_Opacity;

        varying highp vec2 qt_TexCoord0;

        void main () {
          gl_FragColor = texture2D(image, qt_TexCoord0) *
            texture2D(mask, qt_TexCoord0).a *
            qt_Opacity;
        }
      "
    }
  }
}